Re: [PATCH 6/6] HID: magicmouse: Adjust major / minor axes to scale

[Michael Poole <mdpoole@troilus.org>]

On Mon, 2010-08-30 at 13:20 -0400, Chase Douglas wrote:
> From: Henrik Rydberg <rydberg@euromail.se>
> 
> By visual inspection, the reported touch_major and touch_minor axes
> are roughly a factor of four too small. The factor is approximate,
> since the protocol is not known and the HID report encodes touch size
> with fewer bits than positions. This patch scales the reported values
> by a factor of four.
> 
> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

Acked-by: Michael Poole <mdpoole@troilus.org>

I never did figure out a more elegant or robust way to figure out this
scaling factor.  Four seems like about the right number.

> ---
>  drivers/hid/hid-magicmouse.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
> index 687dde4..b051f7d 100644
> --- a/drivers/hid/hid-magicmouse.c
> +++ b/drivers/hid/hid-magicmouse.c
> @@ -253,8 +253,8 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
>  	/* Generate the input events for this touch. */
>  	if (report_touches && down) {
>  		input_report_abs(input, ABS_MT_TRACKING_ID, id);
> -		input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major);
> -		input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor);
> +		input_report_abs(input, ABS_MT_TOUCH_MAJOR, touch_major << 2);
> +		input_report_abs(input, ABS_MT_TOUCH_MINOR, touch_minor << 2);
>  		input_report_abs(input, ABS_MT_ORIENTATION, orientation);
>  		input_report_abs(input, ABS_MT_POSITION_X, x);
>  		input_report_abs(input, ABS_MT_POSITION_Y, y);